Derivative Financial Instruments (Schedule Of Gains And Losses Related To Derivative Instruments Not Designated) (Details) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount of Gain (Loss) Recognized in Earnings on Derivatives	$ (2,618)	$ 301	$ 41,927
Other Nonoperating Income (Expense) [Member]
Amount of Gain (Loss) Recognized in Earnings on Derivatives			30,200
Interest Rate Swap [Member] | Interest Expense [Member]
Amount of Gain (Loss) Recognized in Earnings on Derivatives	0	0	(1,444)
Foreign Exchange Forward [Member] | Other Nonoperating Income (Expense) [Member]
Amount of Gain (Loss) Recognized in Earnings on Derivatives	(2,618)	301	1,279
Other Contract [Member] | Other Nonoperating Income (Expense) [Member]
Amount of Gain (Loss) Recognized in Earnings on Derivatives	$ 0	$ 0	$ 42,092